free solo climbing

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a dangerous form of rock climbing where the climber makes the climb alone, and without ropes or any other equipment

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also known as "free soloing".
Example: Free solo climbing is a high-stakes game. It's either death or perfection. But in moments of such risk, adrenaline is often the enemy. [https://edition.cnn.com/2019/02/21/sport/free-solo-alex-honnold-rock-climbing-el-capitan-spt-intl/index.html]